Bookmark this link https://myproconnect.intuit.com/releasedates

Learn how to Click around > Tax Product Family has a dropdown > Pick CORPORATION = 1120 & States

Scroll down to MS and click the V to expose release dates AND where you can click "Form Info" to find out about specific forms for that state. 

According to this info page, it is out, but that has been known to be wrong or the release that is out is not really functional. The form info would lead me to think 1/29/2021 is the target date for functional.